"... The malice with which you chose to invoke certain unverified, sensationalist and patently inaccurate information, ostensibly at the behest of your party members... has compelled my client to address you vide this letter," said the notice, sent to the PM's official residence and the BJP state headquarters.
The state BJP leadership termed it as a "meaningless move" out of fear of defeat in the Lok Sabha polls.
"You (PM Modi) made certain wildly fabricated allegations with the sole intent to mislead the people you were addressing, in order to besmirch my client's well-earned reputation. Your speech punctuated by false, malicious and defamatory content, was an embodiment of political calculation and mischievous intent," the notice said.
"Such vile and vindictive statements are unbecoming of the post you hold... In the event, an unconditional apology is not issued within 36 hours, my client will be constrained to initiate appropriate proceedings against you in accordance with the laws of this country without any further notice," the notice said.
Reacting to the development, BJP state vice-president Jaiprakash Majumdar said, "The elections (seventh phase) are going to be held tomorrow. Today, such a letter means nothing. It is a meaningless move out of fear of defeat.